[GHC] #11529: Show instance of Char should print literals for non-ascii printable charcters

[GHC]

#11529: Show instance of Char should print literals for non-ascii printable
charcters
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        Reporter:  nushio            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by nushio):

 (+1) to suggestion that to change the default interactive printer to
 display unicode characters nicely.
 The algorithm in `unicode-show` might be suitable for the purpose,
 although there should be various opinions on what is the "nice way to
 print unicode."

 By the way, if we update the default interactive printer, will we be
 breaking the `doctests` that `show`s values with unicodes, forcing them to
 update the expected results from the interpreter?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11529#comment:11>
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